Question:
Study the following statements regarding immune system and choose the correct statements:
I. Memory B-cells are responsible for rapid and enhanced secondary immune response.
II. Complement system proteins are mainly present in blood plasma and are part of adaptive immunity.
III. Cell mediated immunity is mainly carried out by cytotoxic T-cells.
IV. Plasma cells directly attack and phagocytose pathogens.
Study the following statements regarding immune system and choose the correct statements:
I. Memory B-cells are responsible for rapid and enhanced secondary immune response.
II. Complement system proteins are mainly present in blood plasma and are part of adaptive immunity.
III. Cell mediated immunity is mainly carried out by cytotoxic T-cells.
IV. Plasma cells directly attack and phagocytose pathogens.
Show Hint
Memory cells = Secondary response; Cytotoxic T-cells = Cell-mediated response.
Updated On: Jun 6, 2026
- I and III
- I, II and III
- II and IV
- I and IV
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Concept
Immune system components and responses.
Step 2: Meaning
Evaluating the roles of immune cells and protein systems.
Step 3: Analysis
Memory B-cells facilitate a rapid secondary response (I is correct). Complement proteins are part of innate, not adaptive, immunity (II is incorrect). Cell-mediated immunity is driven by T-cells (III is correct). Plasma cells secrete antibodies but do not phagocytose pathogens directly (IV is incorrect).
Step 4: Conclusion
Only statements I and III are correct.
Final Answer: (A)
Immune system components and responses.
Step 2: Meaning
Evaluating the roles of immune cells and protein systems.
Step 3: Analysis
Memory B-cells facilitate a rapid secondary response (I is correct). Complement proteins are part of innate, not adaptive, immunity (II is incorrect). Cell-mediated immunity is driven by T-cells (III is correct). Plasma cells secrete antibodies but do not phagocytose pathogens directly (IV is incorrect).
Step 4: Conclusion
Only statements I and III are correct.
Final Answer: (A)
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